Khi mắc nối tiếp thì
\(R_{nt}=R_1+R_2=100\) Ω
Khi mắc song song thì
\(R_{ss}=\frac{R_1R_2}{R_1+R_2}=16\) Ω
\(\Rightarrow\left\{{}\begin{matrix}R_1+R_2=100\\R_1R_2=1600\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}R_1=20\Omega\\R_2=80\Omega\end{matrix}\right.\)